notification of solar PV panel system (installation) to the electric grid operator

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Note added at 12 hrs (2023-03-09 06:57:59 GMT)
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Distribution network operators (DNOs) manage the distribution of electricity around the country. They own and operate the wires that carry electricity from the grid into your home.

If you have generation equipment like solar panels installed at your home, your DNO usually needs to be notified about the installation.
https://help.bulb.co.uk/hc/en-us/articles/360057168551-Gener...

How to register energy devices in homes or small businesses: guidance for device owners and installation contractors
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2. Determine if you needy to notify the Distribution Network Operator (DNO) before or after installation.
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4. Ensure installation is notified with the appropriate bodies.
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You must notify your local DNO if you make any significant change to your connection, such as installing one of the following energy devices:

solar photovoltaic (PV)
heat pump
electric vehicle (EV) charge point
battery storage

https://www.gov.uk/government/publications/register-energy-d...